This story is infuriatingly relatable. It is great for sparking discussions on life experiences, especially at the age of many first time older siblings. Protagonist Sophie, as demonstrated by the title, gets angry at her little sister, but after removing herself from the situation, she learns to cope with her anger in a healthy way. Rated “K” on Scholastic’s guided reading scale, this is a great character building book for kindergarten and 1st grade.